Electron-discharge device



July 20,1926. 7 v 1,593,483

M. YAMAMQTO ELECTRON DISCHARGE DEVICE Filed March 7. 1924 Msaaifmma/a Patented July 20, 1926.

UNITED STATES PATENT OFFICE.

mSASHI YAMAMQTO, F GLEN HEAD, NEW YORK.

ELECTRON-DISCHARGE DEVICE.

Application filed March 7, 1924. Serial No. 697,650.

This invention relates to electron dis- .charge devices for vacuum tubes used in radio communication and has for its object the provision of a device of this character ing grid elements through which the filaments extend, the corresponding elements being connected in series. I

Another object is the provision of a device of this character in which the maximum size anode plate is provided for the minimum size of filament, the parts being furthermore so constructed and arranged as to insure greater efliciency and volume than can be attained with the ordinary type of modulation device.

With the above and other objects and advantages in view the invention consists in the details of construction to be hereinafter more fully described and claimed and illustrated in the accompanying drawings, in which:

v Figure 1 is a sectional view taken longitudinally of a vacuum tube constructed in accordance with my invention,

a Figure 2 is a cross section.

Referring more particularly to the drawings the tube comprises the usual glass shell or bulb which is highly evacuated and which is provided with the usual base 11 carrying terminal contacts 12, 13, 14 and 15 for electrical connection with socket terminals. Also provided on the base is the usual pin 16 which is adapted for engagement within the bayonet slot provided in the conventional tube socket for holding the tube properly in place with the contacts thereof engaging the contacts in the socket. Within the lower portion of the tube is the usual glass support 17 through which pass the wires to be described.

Located in spaced parallel relation within the tube and extending longitudinally thereof are rods 18 which are embedded at one end within the glass support 17- and which have their other ends mechanically connected by a block or plate 19 of suitable nonconduct-ing material. Connected with the anchored end of one rod is a wire 20 which leads to the plate terminal 15. The rods 18 carry cylindrical metallic members 21 which.

constitute the electron collecting or anode plates and these two cylindrical members ar in contact with each other.

Depending from the center of the block 19 is a double armed hanger '22, terminating in hooks 23 on which are engaged filaments 24: and 25 which are thus connected in series. These filaments are secured to wires 26 and 27 which are embedded and sealed within the glass support 17 and which lead to the positive and negative terminals 12 and 13 respectively.

The numeral 28 designates two grid elements which are of coil formation and which are located within and in spaced relation to the cylindrical plate elements 21. The ends of the Wires forming the grids are embedded in the glass support 17. The other ends of the grids are connected by a wire 29 which extends through holes in the block 19 and by this means the grids are connected in series. Leading from one of the embedded ends of the grid wires is a wire 30 which is brought to the grid contact 14.

The tube is used in exactly the same manner as any other tube but it has the great advantage of having a very large electron collecting surface or anode plate. The tube will thus have double etficiency and greater volume than those ofthe ordinary type.

While I have shown and described the preferred embodiment of my invention it is of insulating material, a pair of similar cylindrical plate elements located between said upright rods in contacting relation thereto and in contacting relation to each other, helical grids located within said cylindrical plate members and connected in series, and a filament located axially within each grid, the filaments being connected in series, said insulating strip constituting the support for the grids and carrying supporting means of a metallic nature for the filaments for electrically connecting them. 1

in testimony whereof I aifix my signature. 

